Process of forming turnbuckles or the like



C. E- ANDERSON.

PROCESS OF FORMING TURNBUCKLES OR THE LIKE.

APPLICATION FILED NOV. 29. I920.

' 1,413,821. Patented Apr- 25, 1922.

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OOOOOOOOOOO RMING TURNBUCKLES OR THE LIKE.

A P P L I c A T l o N F L E D N o V l 2 9 I 9 2 o:

1 ,4; 1 3,82 1 Patented Apr. 25, 1922'.

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UNITED STATES PATENT orF cE.

CARL E. ANDERSON, or "GRA D HAvEn', meme.

rnoc'nss or FORMING runneuoxnus ORATHE {mm-i.

Specification of Letters Patent.

Patented Ap 25.119225.

- Application 'flledNovember 29, 1920. Serial No. 426,951.

.ture and particularly to a process of Ifor ing a turn-buckle. The principal object of the invention is'to provide means for forminga turn-buckle from a single piece of sheet metal. Still another object is to provide a punching and drawing process of forming a turn-buckle from a single sheet of metal. Other objects relate to various features of the process such as will appear more fully hereinafter.

The nature of the invention will be understood from the following specification taken with the accompanying drawings, in which the article of manufacture in the various stages of its formation and the apparatus for performing the various steps of the process have been illustrated.

In the drawings Figure '1 shows a vertical section through a die punch machine, illustrating the first operation upon the sheet metal blank;

Fig. 2 is a vertical section through another form of die punch, illustrating the operation performed on the article after ithas been put into the form illustrated in Fig. 1;

Fig. 3 shows a vertical section through another form of die punch, illustrating the method-of operating upon the blank after it lfias been put into the, form illustrated in Fig. 4 shows a plan view of. the article after it has been operated upon'by the mechanism illustrated inFig. 3;. r i

.Fig. '5 shows the article of Fig. 4 after I it has been flattened out;

' Fig. 5;

Fig. 6 shows theapparatus for shearing off the lateral edges of the article after'it has been put into theform illustrated in I 7 shows a vertical section through a perforating punch :and die fo'r forming apertures through the ends of the cylindrical projections of the turn buckle; and t Fig. 8 shows .a vertical section through a Fig.

- block 13.-

punch and die for imparting'a curvedcontour to each of the lateral walls of the turn? buckle. j

The turn-buckle is. formed from a single sheet of sheet steel orfother metalrof uni-j form'thickness which is out to form abl-afnk of circular form. This circular blank is then operated upon by the mechanism illus trated in Fig. 1, This mechanism comprises adie holder lOwhichriis-cut away on its upper side to form a cylindrical re-' cess lladaptedto receivean annular tension plate 1 2 which'surroundsthe center The tension plate 12- normally tends to move-upwardly on the center block under the influence of the stripper pins 14 which extend downwardly through apertures in the dieholder and are actuated by a spring; in the usual manner, Ablanking die 15 seats in an annular recess 16 formed in the upper: surface of the; die holder around the-recess 11 and theinner annular wall of the blanking die'i-s adapted to form a continuation of the annular wall of the recess 11. Thesheet' 'metal' blank 18 of circular form is placed upon the center block 13 within the blanking die 15.-a 1d the lateral edges thereof are forced downwardly by means of anannular blanking and draw ing punch 19 which is carried .by the punch holder 20,. I A knockout punch 21 is mounted within the blanking and drawing .punch 19 and is adapted to force theblank181downwardly against the center block :13. Tl The stem 22 of the'knockoutpunch eXte-ndsupward'lythroughv the punch holder and is capableof movement therein for the purpose of. ejecting the blank from thedrawing punch 1I9'after the blank 18 has been put-into cup-shaped form, as. illustrated in F 1', by the'operationof the mechanism. .j.

The cup-shaped bla killustrated in Fig. 1 is then operated, upon by the'inechanism; illustratedin .2 which comprisesadie. shoe 25 having an annular perforating die mounted: thereon. An annular .gaugeQfZ,

having an internal diameter-I-slightly greater than the internal "tapered. boren26 of the perforating :die,: is mounted on. the 'dieaTn-d is adapted to hold the cup-{shaped blankg holder 29. When the- .punoh moves,-dew-1,1- wardly it cooperates with the die 26 tocut a circular slug 30 fromft-he bottom of the position to receive the-perforating punch v28 which is carried bythe movable punch cup=shaped :hlank, thus leaving acylindrical 7 i ring of metal 31 to be operated upon by the succeeding steps of the process. This apparatus comprises a die holder 32 adapted to support two sliding blocks 33 having horns or punches 34 formed on the upper sides thereof and extending laterally in opposite directions. These horns are adapted to enter recesses 35 which are formed in sliding blocks 36 mounted above the blocks 33 and provided on their outer sides with inclined faces 36 which are adapted to be engaged by the inner inclined faces 37 of the cam blocks 37. A punch holder 38 carries a taperedpunch or spreading tool 39 which is adapted to pass between the sliding blocks 33 andforce them outwardly by (:0

} projections 41 on opposite sides of the cylin action with their inner inclined faces 33, the central part of the die holder 32 being provided with an aperture 40 to receive the lower end of the spreading tool upon the downward movement thereof. When the tool 39 moves downwardly a punch holder 38' engages the cams 37 and causes them to move the sliding blocks 36 inwardly in opposition to the punches 34 formed on the blocks 33. The circular sheet metal article 31, as illustrated in Fig. 2, is placed in position with the lateral walls thereof extend ing around the projecting horns 34 and lying within the sliding blocks 36. The downward movement of the spreading tool 39 and the corresponding movement of the punch holder 38 then operate to project the metal outwardly on diametrically opposite parts of the sheet metal article to form substantially cylindrical projections 41, as illustrated in Fig. 4. The blocks 33 and 36 may be changed at different stages of the'process so that the punches 34 and recesses 35'may gradually be increased in depth as the process is carried on, thus gradually forming the drical article 31. After forming the article as illustrated in" Fig. 4, it is placed in a press and compressed in a plane at right angle to "the cylindrical projections 41, thereby projecting it into the elongated shape 42 illustrated in Fig. 5, wherein the side walls lie substantially parallel to each other and unite the opposite cylindrical projections.

p After the article 42 has been formed into. the shape illustrated in Fig. 5,.i't is oper-.

1 ated upon'by the mechanism illustrated in Fig. 6, wherein the die holder, 45 is shown supporting a die 47, the cutting edge of which is adapted to cooperate with the later-' I ally extending projection 48 of a punch 48 mounted in the punchlholder 49. The article 42 is placed on the die with its lateral edge lying parallel to and overlapping the cutting edge thereof, whereupon the down ward'movement' of the punch operates to trim off a portion 5O of the lateral edge of thewa'll of the article, thus providing 'oppo. site parallel walls of uniform width.

.in the article, thereby formingan aperture through the end wall of the cylindrical projection. I

After-the article has been operated upon by the mechanism illustrated in Fig. 7, it is further subjected to compression in the mechanism of Fig. 3. "This-apparatus com prises a die holder having a die 56 mounted thereonand adapted to cooperatewith apunch 57 carried by the punch holder 58.

The die 56 and the punch 57 are provided with cooperating inclined surfaces 56" and 5?, respectively. which insure the proper registration of'the coacting parts when'the punch moves downwardly; The turnbuckle is placed in. a depression 59 which. is formed in the die and it is engaged bythe walls of another. depression 60 formed in the punch. W hen the parts come together these walls of the depressions formed in the die and in the punch operate to impart a curved cross section to each of the lateral walls of the turn-bucklef After the lateral walls have been curved, the cylindrical projections may be internally threaded if desired.

It will. be] apparent from the foregoing that I have provided a novel process of forming anarticle of irregular shape from a single sheet of metal by an improved method of punching and drawing the metal. Although Thaw-explained a particular application of the process to, illustrate its use in forming a particular article of manufacture. it will be understood that it may be I employed in various ways without depart ing from the scope of the appended claims.

1. The process of forming a turnbuckle which comprises the operations offorming an annularsheet metal ring; and forming al substantially cylindrical projection in the wallet the ring. 3' 1 2; The p'rocess of'iforming a turnbuckle which comprises the operations of forming anannular sheet fring; "and forming substantially cylindrical projections on op posite sides of said sheet metal ring.

3. Theprocess' offorming a turnbuckle which comprises the operations offorming an annular sheet metal ring, forming sub stantially cylindrical projectionsonoppos'ite side'sofsaid sheet metal ring, and'flattenin'g said ring transversely to "the longitudinal axes of said'cylindrical'projections]:

- 4. The process of forming a turnbuckle which comprises the operations of forming a cup-shaped sheet metal article, cutting away the lower Wall of said article, and forming diametrically cylindrical projections in the annular wall of said article.

5. The process of forming an article of manufacture which comprises the operations of forming a cup-shaped sheet metal article,

' cutting away the lower wall of said article,

forming diametrically cylindrical projections in the annular wall of said article, flattening said annular walls between said projections and transversely to the longitudinal axes of said projections, and forming apertures through the end walls of said projections.

7. The process of forming an article of manufacture which comprises the operations of forming a cup-shaped sheet metal article, cutting away the lower wall of said article, forming diametrically cylindjrical projections in the annular wall of said article, flattening said annular walls between said projections and transversely to the longitudinal axes of said projections, and trimming off the edges of the flattened walls extending between said projections. 8. The process of forming a turnbuckle which comprises the operations of forming an annular sheet metal ring, forming substantially cylindrical projections in the wall of said ring, and imparting a curved trans verse cross section to the wall of said ring I between said cylindrical projections.

9. The process of forming a turnbuckle which comprises the operations of fOI'miHg projections.

an annular-sheet metal ring, forming subof said ring, imparting a curved transverse cross section to the wall of said ring bet-ween said cylindrical projections, and forming apertures through the end walls of said 10. The process of forming a turnbuckle which comprises the operations of formingv an annular sheet metal ring, forming substantially eylindricalprojectionsin the wall of said ring, imparting a curved cross section to the wall of said ring between said c-y lindrical projections, forming apertures through the end walls of said projections, and internally threading said projections.

manufacture which comprises the operations of forming an annular sheet me'tal'ring, forming substantially cylindrical projections extending outwardly on opposite sides of said ring, pressing the walls of said ring into parallel relation to said projections, and forming apertures through the end walls of said projections.

' v12. The process of forming an article of manufacture which comprises the operations of cut-ting a circular sheet metal blank,

projecting said blank into cup-shaped form, I

11. The process of forming an article'of I parting a curved cross section to each of i said parallel walls.

In testimony whereof, my name.

- CABLE, ANDERSON.

I have subscribed 45 stantially cylindrical projectionsin the wall 

